Sheet for a mine floor or a road, and method

Abstract

A sheet for forming a floor in a mine or for forming a road on permafrost. A method for making a sheet that is a closed foam celled sheet. A system for making a sheet.

The invention claimed is: 
     
       1. A sheet for a floor comprising:
 a top surface, a bottom surface adapted to be positioned on ground, a first side and a second side, a closed foam cells core between the top surface and the bottom surface in the first side and the second side, the top surface and the bottom surface and the first side and the second side made out of the closed foam cells, the core supporting at least 1000 psi of compressive force, the top surface being at least 2 feet wide by 4 feet long, the sheet weighing less than 40 lbs, and is one continuous flat sheet; and 
 gravel disposed on the top surface. 
 
     
     
       2. The sheet of  claim 1  wherein the core includes dibutyltin dilaurate, and diphenylmethane. 
     
     
       3. The sheet of  claim 2  wherein the core is phthalate free. 
     
     
       4. The sheet of  claim 3  which has a rectangular shape. 
     
     
       5. The sheet of  claim 4  including an insert disposed in the core. 
     
     
       6. The sheet of  claim 5  wherein the insert is metal wiring. 
     
     
       7. The sheet of  claim 6  wherein the metal wiring has a shape of a metal cage. 
     
     
       8. A sheet for a road comprising:
 a top surface, a bottom surface adapted to be positioned on ground, a first side and a second side, a closed foam cells core between the top surface and the bottom surface in the first side and the second side, the top surface and the bottom surface and the first side and the second side made out of the closed foam cells, the core supporting at least 1000 psi of compressive force, the top surface being at least 40 yards long and 6 feet wide and the sheet being one continuous flat piece; and 
 gravel disposed on the top surface. 
 
     
     
       9. The sheet of  claim 8  wherein the core includes dibutyltin dilaurate, and diphenylmethane. 
     
     
       10. The sheet of  claim 9  wherein the core is phthalate free. 
     
     
       11. The sheet of  claim 10  including an insert disposed in the core. 
     
     
       12. The sheet of  claim 11  wherein the insert is metal wiring. 
     
     
       13. The sheet of  claim 12  wherein the metal wiring has a shape of a metal cage.